Long ago, Nostradamus foresaw that on 03/25/2013 05:45 PM, BjörnNadrowski would write:

You were right,the data has been overwritten.It now reads thus (or rather, the first instance of human-readablevolume group description reads thus; my old volume group descriptionis still there, but further down...):

Now you are getting somewhere. The offset of your PV has shifted. First, copy that 2nd human readable part to removable media somewhere. If possible, backup your drives (e.g. to USB drives) so you can recoverfrom further mistakes.

Why has the offset shifted? Possibilities:

1) different md driver version on knoppix (although using an olderversion would move the md superblock from end of drive to beginning ofdrive - shifting the opposite way). Or different options. BUT mdadmseemed to recognize your RAID, so let'sdiscount this theory.

2) alignment options to pvcreate - but it still should have been seen bylvs!

3) the offset hasn't shifted, but you've written over the first fewsectors with the empty VG. Is the 2nd human readable part, by anychance, missing the first part? You could post both parts for us tolook at.